Bring the nightly merge jobs forward

This brings it to the slot vacated by nightly-tests, so we don't waste
an hour waiting to start the jobs.

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
Change-Id: I23bcb86c4474e495b57d6331e081a874c06f8715
diff --git a/mbedtls-repo-scan-scheduler.yaml b/mbedtls-repo-scan-scheduler.yaml
index b201215..6ae8b77 100644
--- a/mbedtls-repo-scan-scheduler.yaml
+++ b/mbedtls-repo-scan-scheduler.yaml
@@ -12,7 +12,7 @@
     project-type: pipeline
     sandbox: true
     triggers:
-    - timed: 0 21 * * *
+    - timed: 0 20 * * *
     properties:
     - build-blocker:
         block-level: GLOBAL